For consistency, name 'pdf417' image directory as 'pdf417-1'

git-svn-id: http://zxing.googlecode.com/svn/trunk@2700 59b500cc-1b3d-0410-9834-0bbf25fbcc57
correct maximum number of codewords in symbol
Suppress some spurious warnings and allow javac lint

git-svn-id: http://zxing.googlecode.com/svn/trunk@2701 59b500cc-1b3d-0410-9834-0bbf25fbcc57
Merge remote-tracking branch 'zxing-main/http' into pdf417-dev